This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 25 |
| 3 | 121 |
| 4 | 1369 |
| 5 | 10201 |
| 6 | 100489 |
| 7 | 1018081 |
| 8 | 10004569 |
| 9 | 100140049 |
| 10 | 1000267129 |
| 11 | 10000600009 |
| 12 | 100008370081 |
| 13 | 1000006000009 |
| 14 | 10000033772089 |
| 15 | 100000380000361 |
| 16 | 1000000025191729 |
| 17 | 10000001400000049 |
| 18 | 100000000621806289 |
| 19 | 1000000014000000049 |
| 20 | 10000000055856073561 |